Comment out LIMIT 0 case because of the mixed results

lib/private/db/querybuilder/querybuilder.php

@@ -237,6 +237,10 @@ class QueryBuilder implements IQueryBuilder {
 	/**
 	 * Sets the maximum number of results to retrieve (the "limit").
 	 *
+	 * NOTE: Setting max results to "0" will cause mixed behaviour. While most
+	 * of the databases will just return an empty result set, Oracle will return
+	 * all entries.
+	 *
 	 * @param integer $maxResults The maximum number of results to retrieve.
 	 *
 	 * @return \OCP\DB\QueryBuilder\IQueryBuilder This QueryBuilder instance.

tests/lib/db/querybuilder/querybuildertest.php

@@ -124,7 +124,8 @@ class QueryBuilderTest extends \Test\TestCase {
 	public function dataMaxResults() {
 		return [
 			[null, [99, 98, 97, 96, 95, 94, 93, 92, 91]],
-			[0, []],
+			// Limit 0 gives mixed results: either all entries or none is returned
+			//[0, []],
 			[1, [99]],
 			[5, [99, 98, 97, 96, 95]],
 		];